Isophotal mass-size relation. Left panel: the relation between R_25.5, 3.6 and stellar mass, in which R_25.5, 3.6 was derived from the raw surface brightness profiles. Right panel: the same but with R_25.5, 3.6 corrected for inclination, measured from the outermost isophote shapes’ axial ratios. ETG data points are multicolored (with dwarfs in cyan), while LTGs are shown in gray. The arrow indicates the galaxy IC 3413 (see text).